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Finding the Fourth Proportional to 60.55, 90.70 and 57.21

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Solution

The fourth proportional to 60.55, 90.70 and 57.21 is: 85.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.55 : 90.70 = 57.21 : x
  2. Step 2: Convert to fraction form
    60.55/90.70 = 57.21/x
  3. Step 3: Cross multiply
    60.55x = 90.70 × 57.21
  4. Step 4: Simplify right side
    60.55x = 5,188.66
  5. Step 5: Solve for x
    x = 5,188.66/60.55
  6. Step 6: Final answer
    x = 85.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.